Mark several media tests for auto rebaselines after Chrome r275501
Mark several media tests for auto rebaselines after Chrome r275501

BUG=369375
TBR=sandersd@chromium.org

Review URL: https://codereview.chromium.org/321603002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@175702 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs